The 2N 9151198SET security bundle provides the very highest level of security for your entrance doors. It is comprised of an add-on switch also including a tamper switch and a security relay. The individual components of the bundle can also be ordered separately. The additional switch allows you to control a second appliance passive switching for an unlimited period max. 30 V/1 A or active 12 V DC/max 700 mA. It also includes a tamper switch to signalize if the front panel is opened. The security relay is a simple add-on device that prevents unauthorized manipulation with the lock. It is installed between the intercom from which it is powered and the lock which it controls.